salt found 1,000 feet below the sea bed holds clues to our planet’s past – and a warning. The salt reveals during warm periods in Earth’s history, the region – the Dead Sea is bordered by Palestine, Jordan, and Israel – suffered from drought with no known precedent. The salt, scrutinized by an international team of researchers led by Yael Kiro of Columbia University , doesn’t just offer a history lesson, but a caution climate change could seriously dry the region again in the future.